Leviathan may refer to:
- The character from Atlantis: The Lost Empire
- The character from Digimon Universe: Appli Monsters
- The character from Dungeons and Dragons
- The character from Final Fantasy
- His counterpart from Final Fantasy XV
- The character from Granblue Fantasy
- The character from Hellraiser
- The character from My Vampire Older Sister and Zombie Little Sister
- The character from RWBY
- The character from Sin: The 7 Deadly Sins (Hobby Japan)
- The character from SOMA
- The character from StarCraft
- The character from The Unwritten
- The character from Parahumans
- The species from Apex Legends
- The species from Mass Effect
- The species from Metroid
- The species from Star Wars
- The species from Supernatural
See also: